EN 1.7379 (G17CrMo9-10) Cast Steel
EN 1.7379 steel is an alloy steel formulated for casting. Cited properties are appropriate for the quenched and tempered condition. 1.7379 is the EN numeric designation for this material. G17CrMo9-10 is the EN chemical designation.
It has a moderately low thermal conductivity and a moderately high base cost among cast alloy steels.
The graph bars on the material properties cards below compare EN 1.7379 steel to: cast alloy steels (top), all iron alloys (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.
Mechanical Properties
Brinell Hardness
200
Elastic (Young's, Tensile) Modulus
190 GPa 28 x 106 psi
Elongation at Break
21 %
Fatigue Strength
320 MPa 46 x 103 psi
Impact Strength: V-Notched Charpy
45 J 33 ft-lb
Poisson's Ratio
0.29
Shear Modulus
74 GPa 11 x 106 psi
Tensile Strength: Ultimate (UTS)
670 MPa 96 x 103 psi
Tensile Strength: Yield (Proof)
460 MPa 66 x 103 psi
Thermal Properties
Latent Heat of Fusion
260 J/g
Maximum Temperature: Mechanical
460 °C 860 °F
Melting Completion (Liquidus)
1470 °C 2670 °F
Melting Onset (Solidus)
1420 °C 2600 °F
Specific Heat Capacity
470 J/kg-K 0.11 BTU/lb-°F
Thermal Conductivity
39 W/m-K 23 BTU/h-ft-°F
Thermal Expansion
13 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
7.6 % IACS
Electrical Conductivity: Equal Weight (Specific)
8.8 % IACS
Otherwise Unclassified Properties
Base Metal Price
3.8 % relative
Density
7.8 g/cm3 490 lb/ft3
Embodied Carbon
1.8 kg CO2/kg material
Embodied Energy
23 MJ/kg 10 x 103 BTU/lb
Embodied Water
59 L/kg 7.0 gal/lb
Common Calculations
PREN (Pitting Resistance)
5.7
Resilience: Ultimate (Unit Rupture Work)
120 MJ/m3
Resilience: Unit (Modulus of Resilience)
550 kJ/m3
Stiffness to Weight: Axial
13 points
Stiffness to Weight: Bending
24 points
Strength to Weight: Axial
24 points
Strength to Weight: Bending
22 points
Thermal Diffusivity
11 mm2/s
Thermal Shock Resistance
19 points
Alloy Composition
Among cast alloy steels, the composition of EN 1.7379 steel is notable for containing comparatively high amounts of molybdenum (Mo) and chromium (Cr). Molybdenum is used to facilitate tempering. In addition, it offers modest bonuses to a wide range of material properties. Chromium is used to improve corrosion resistance and most mechanical properties (particularly at higher temperatures).
| Fe | 94.5 to 96.5 | |
| Cr | 2.0 to 2.5 | |
| Mo | 0.9 to 1.2 | |
| Mn | 0.5 to 0.9 | |
| Si | 0 to 0.6 | |
| C | 0.13 to 0.2 | |
| S | 0 to 0.030 | |
| P | 0 to 0.025 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
ISO 4991: Steel castings for pressure purposes
EN 10293: Steel castings - Steel castings for general engineering uses
Creep-Resistant Steels, Fujio Abe et al. (editors), 2008
ASM Specialty Handbook: Carbon and Alloy Steels, J. R. Davis (editor), 1996
Manufacture and Uses of Alloy Steels, Henry D. Hibbard, 2005
Ferrous Materials: Steel and Cast Iron, Hans Berns and Werner Theisen, 2008
Steels: Processing, Structure, and Performance, 2nd ed., George Krauss, 2015